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Note New Accounting Pronouncement - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Mar. 31, 2018 | Jan. 01, 2018
New accounting pronouncements or change in accounting principle |  |  |  |  |  |
Restricted Cash Money Market | $ 9,216 | $ 9,772 | $ 11,803 |  |  |
Cumulative effect of accounting change | 1,935 |  |  |  |  |
ASU 2016-01 |  |  |  |  |  |
New accounting pronouncements or change in accounting principle |  |  |  |  |  |
Cumulative effect of accounting change |  |  |  |  |  | $ 600
Reclassification From Trading And Available For Sale Securities To Equity Securities |  |  |  |  |  | $ 11,000
ASU 2016-02 |  |  |  |  |  |
New accounting pronouncements or change in accounting principle |  |  |  |  |  |
Cumulative effect of accounting change |  |  |  | $ 4,800 |  |
Operating lease right of use asset |  |  |  | 139,000 |  |
Operating Lease Right Of Use Asset Escalation Clauses |  |  |  | 15,000 |  |
Opearing lease liability |  |  |  | $ 154,000 |  |
ASU 2016-15 |  |  |  |  |  |
New accounting pronouncements or change in accounting principle |  |  |  |  |  |
Reclassification From Operating To Investing Activities |  | 500 |  |  |  |
ASU 2016-16 |  |  |  |  |  |
New accounting pronouncements or change in accounting principle |  |  |  |  |  |
Cumulative effect of accounting change |  |  |  |  | $ 1,300 |
ASU 2017-07 |  |  |  |  |  |
New accounting pronouncements or change in accounting principle |  |  |  |  |  |
Reclassification Other Components From Personnel To Other Operating Expenses | $ 8,900 | $ 7,500 | $ 10,100 |  |  |

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